Salvarsan-needle.



J. H. STEVENS. SALVARSAN NEEDLE.

APPLICATION FILED JULY 16, 1913 1,087,845., Patented Feb. 17, 1914.

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Inventor.

-' James H. STevens,

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COLUMBIA PLANbGRAPH co., WASHINGTON. D4 4:.

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JAMES H. STEVENS, OF BOSTON, MASSACHUSETTS.

SALVARSAN-NEEDLE.

To all whom it may concern:

Be it known that 1, JAMES H. STEVENS, a citizen of the United States,residing at Boston, county of Suffolk, State of Massachusetts, haveinvented an Improvement in Salvarsan-Needles, of which the followingdescription, in connection with the accompanying drawing, is aspecification, like characters on the drawing representing like parts.

This invention relates to so-called salvarsan needles which are used forpuncturing the vein of a person for the purpose of introducing a fluidthereinto and it has particular reference to a cannula needle of thistype.

The object of the invention is to provide a novel construction by whichthe desired fluid can be injected into the vein without danger that anyair will be sucked through the needle into the vein during thisoperation.

I will first describe some selected embodiments of my invention fromwhich the principle thereof will be readily ascertained and T will thenpoint out the novel features of the invention in the appended claims.

Referring to the drawings, Figure 1 is a longitudinal sectional viewthrough a needle embodying my invention showing the parts in positionfor being inserted into the vein. Fig. 2 is a similar section showingthe cannula moved forward into position to protect the point of theneedle, which is the position of the parts when the fluid is beinginserted. Fig. 3 is a fragmentary sectional view showing a differentembodiment of the invention. Fig. 4 is a section on the line w09, Fig.3.

The needle herein illustrated comprises a tubular sheath 1 having apoint 2 and cutting edge 3 at one end and blunt ended cannula 4t whichis slidably mounted in the sheath and is provided with an axial duct 5through which the liquid is introduced into the vein. The cannula isconnected to a tube 6 leading to the receptacle or other apparatuscontaining the fluid tobe injected, such apparatus not being shownherein because it may be of any approved type and forms no part of thepresent invention. The cannula i is of such length that when it is fullyinserted into the sheath the blunt end 7 thereof will extend slightlybeyond the point 2 of the sheath and thus protect the latter.

Specification of Letters Patent.

Application filed July 16, 1913.

Patented Feb. TW, T214.

Serial No. 779,256.

position shown in Fig. 2 thereby protecting the point 2 and cutting edge3 so as to make it impossible for the physician to accidentally puncturethe wall of the vein, and then the fluid is allowed to flow into thevein through the duct 5 of the cannula.

In the use of needles of this type it is extremely important that no airshould be allowed to enter the vein for such an occurrence producesdisastrous effects upon the patient. As stated above it is the object ofmy invention to provide a novel needle of this type which is providedwith means that will exclude the possibility of air entering between thesheath and the cannula thus permitting the needle to be used with nodanger of introducing any air into the vein. The drawings show thepreferred construc tion by which this object is accomplished and onreferring to them it will be seen that the rear or base end of thesheath 1 is provided with an enlarged. chamber 8 and that the rear endof the cannula is provided with the enlarged portion 9 which accuratelyfits the chamber 8. The sheath is also provided with a shoulder 10 atthe outer end of the chamber 8 and the cannula l is provided with acooperating shoulder 11 which is so situated that it will engage theshoulder 10 when the cannula is fully inserted into the sheath. Theportion 9 of the cannula is made so as to accurately it the interiorwall of the chamber 8, thereby providing an air tight joint between thecannula and the sheath.

Means are provided for locking the cannula in either its retracted orprojected position and in Figs. 1 and 2 this means is shown as a setscrew 12 screwed into the wall of the chamber 8 and adapted to engagethe portion 9 of the cannula. In Figs. 3 and i I have shown a slightlydifferent construction wherein a pinion 13 is journaled in the sheathand is adapted to engage annular teeth lt formed on the end of thecannula. The pinion 13 is mounted on a shaft 15 pro vided with a thumbpiece 16 by which it may be turned.

In using the device the physician first withdraws the cannula so as touncover the cutting edge 3 and point 2 of the sheath as shown in Fig. 1and then locks the cannula in such position. The fiuid is then allowedto flow from the apparatus or reservoir until all air is expelled fromthe tube 6, duct 5 and chamber 8. If desired, the needle may be insertedinto a body of fiuid when the cannula is withdrawn so that the act ofwithdrawing the cannula will fill the cham ber .S with the fluid. In anyevent, after all air has been expelled from the ducts and chambers inthe needle then the needle is inserted into the vein of the patient andas soon as blood appears in the glass-indicating tube of the apparatus,the set screw 12 is loosened and the cannula is pushed for ward into theposition shown in Fig. 2 thereby protecting the point 2 and cutting edge3 of the needle. lVhen the cannula is in this position it obviates thepossibility of the wall 01" the vein being punctured by the needleduring the subsequent manipulation of the device. As soon as the cannulahas been pushed forward into the position shown in Fig. 2 the set-screw12 is tightened and the fluid to be inserted into the vein is allowed tofiow through the tube (3 and duct- 5 of the cannula and when asufiicient amount of fluid has been injected, the needle is withdrawn.When the cannula is in its forward position as shown in Fig. 2 theengagement of the shoulders 10 and 11 together with the snug fit betweenthe part 9 of the cannula and the interior wall of the chamber 8 maizean air tight joint which prevents any air from being sucked into thevein between the cannula and sheath.

In using the device shown in Figs. 3 and 1, the operator withdraws thecannula by turning the thumb wheel 16 and then holding the cannula inits withdrawn position by means of the thumb wheel until the needle isinserted into the vein when the cannula is advanced by turning the thumbwheel and is held in its advanced position by applying pressure to thethumb wheel. In other respects the invention shown in Figs. 3 and 4t issimilar to that described in Figs. 1 and 2.

While I have illustrated one embodiment of my invention, yet I do notwish to be limited to the constructional features shown.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent is 1. In a salvarsan needle, the combinationwith a sheath having a pointed end presenting a cutting edge and alsohaving an enlarged chamber at its rear end, of a bluntended cannulaslidable in said sheath and having at its rear end a portion of enlargeddiameter which accurately fits the chamber in the sheath and constitutesan air-tight joint between the sheath and the cannula which will preventany air from being sucked into the vein through the needle.

2. In a salvarsan needle, the combination with a sheath having a pointedend presenting a cutting edge and also having an enlarged chamber at itsrear end and a shoulder at the outer end of the chamber, of a bluntendedcannula slidable in said sheath and having at its rear end a portion ofenlarged diameter which accurately fits the chamber in the sheath andalso having a shoulder sition to protect the point of the sheath whenthe cannula is moved forward into position to protect the point of thesheath whereby an air tight joint will be presented which will preventair from being sucked into the vein through the needle.

3. In a salvarsan needle the combination with a sheath having a pointedend and presenting a cutting edge and also having an enlarged chamber atits rear end, of a bluntended cannula slidable in said sheath and havingat its rear end a portion of enlarged diameter which accurately fits thechamber in the sheath whereby when the needle has been inserted into thevein and the cannula has been moved forward to protect the point of thesheath an air-tight joint is presented between the sheath and thecannula which will prevent any air from being sucked into the veinthrough the needle, and means to lock the cannula in either of itstwo.positions.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesse JAMES H. STEVENS.

\Vitnesses LOUIS 0. SMITH, Tnonas J. DRUMMOND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. G.

It is hereby certified that in Letters Patent No. 1,087,815, grantedFebruary 17, 1914, upon the application of James H. Stevens, of Boston,Massachusetts, for an improvement in Salvarsan-Needles, an error appearsin the printed specification requiring correction as follows: Page 2,line 7 9, for the Words sition to protect the point read which engagesthe shoulder; and that the said Letters Patent should be read With thiscorrection therein that the same may conform to the record of the casein the Patent Olfice.

Signed and sealed this 31st day of March, A. 1)., 1914.

J. T.- NEWTON,

[SEAL] Acting Commissioner of Patente.

